P0604 Code - Internal Control Module Random Access Memory Error

What Does P0604 Mean?

This code indicates that an internal control module random access memory error has been detected in the PCM or one of the other supporting control modules. These control modules may include (but are not limited to) the transmission control module, the body control module, the antilock brake control module, the instrument panel control module, the fuel injection control module, the turbo control module, the anti-theft module, the cruise control module, the traction control module, proximity alert module, and the climate control module.

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What are the common causes of P0604 ?

A P0604 code can have numerous causes, but the most common are:

• Faulty ECM/PCM fuse
• Faulty battery terminal connection
• Low battery voltage
• Faulty ECM power supply circuit wiring
• Faulty ECM

How do you troubleshoot P0604 ?

Deactivation of cylinders is achieved by releasing a synchroniser pin that normally interlocks the cam follower and rocker arms. P0604 code resolves the synchroniser pin is released using hydraulic pressure which is controlled by a dedicated solenoid.

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